WO2022181136A1 - Tissu tissé pour coussin de sécurité gonflable non revêtu - Google Patents

Tissu tissé pour coussin de sécurité gonflable non revêtu Download PDF

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Publication number
WO2022181136A1
WO2022181136A1 PCT/JP2022/002124 JP2022002124W WO2022181136A1 WO 2022181136 A1 WO2022181136 A1 WO 2022181136A1 JP 2022002124 W JP2022002124 W JP 2022002124W WO 2022181136 A1 WO2022181136 A1 WO 2022181136A1
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Prior art keywords
fabric
selvage
air permeability
weaving
woven fabric
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PCT/JP2022/002124
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English (en)
Japanese (ja)
Inventor
啓令 新開
裕也 清水
陸 山田
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東レ株式会社
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Priority to JP2022506703A priority Critical patent/JPWO2022181136A1/ja
Publication of WO2022181136A1 publication Critical patent/WO2022181136A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/23—Inflatable members
    • B60R21/235—Inflatable members characterised by their material
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D03D1/02—Inflatable articles

Definitions

  • the present invention relates to a non-coated airbag fabric capable of maintaining excellent low air permeability required for airbags and low air permeability at high temperatures.
  • the airbag By inflating and deploying inside the vehicle in a very short time after the vehicle crashes, the airbag catches the occupants who move in reaction to the collision, absorbs the impact and protects the occupants. Due to this effect, the air permeability of the woven fabric constituting the airbag is required to be small (low air permeability).
  • the use of automated driving and the expansion of areas where airbags are installed have also progressed. Therefore, as the output of the deployment device is increased, the temperature of the gas generated during the deployment of the inflator is increased (approximately 200°C). Accordingly, there is an increasing need for airbags to maintain low breathability even when exposed to high temperatures.
  • coated fabrics in which resin is applied to fabrics or films are attached, have been proposed.
  • the fabric becomes thicker and less compact when stored, which is disadvantageous as an airbag fabric.
  • the woven fabric has the problem of an increase in manufacturing costs due to an increase in the number of resin coating processes and film pasting processes.
  • Patent Document 1 discloses that by using nylon 66 multifilament with a high boiling water shrinkage (8 to 12%), it is possible to reduce air permeability due to fabric shrinkage under processing conditions.
  • Patent Document 2 by using a synthetic fiber multifilament yarn having a total fineness of 200 to 700 dtex and a single yarn total fineness of 1 to 2dtex, the multifilament yarn constituting the fabric has a close-packed structure, and the initial It is disclosed that not only low air permeability can be obtained, but also low air permeability can be maintained by maintaining a close-packed structure even after an environmental aging test (120° C. for 400 hours).
  • Patent Document 1 achieves low air permeability at approximately 200°C when the airbag is deployed.
  • Patent Document 2 achieves low air permeability without changing the woven structure even under the condition of about 200° C. when the airbag is deployed.
  • the present invention has been made in view of the conventional problems described above, and an object of the present invention is to provide a fabric for non-coated airbags that has a small amount of change between the air permeability after high temperature exposure and the initial air permeability.
  • the non-coated airbag fabric of one aspect of the present invention that solves the above problems is a fabric made of synthetic fibers having a boiling water shrinkage of 5 to 9%, and the air permeability (test differential pressure 20.0 kPa) is 200% or less of the initial air permeability (test differential pressure of 20.0 kPa).
  • FIG. 1 is a schematic diagram for explaining the structure of weaving yarns forming the base portion of the non-coated airbag fabric according to one embodiment of the present invention.
  • FIG. 2 is a schematic diagram for explaining the structure of weaving yarns forming selvages of the non-coated airbag fabric according to one embodiment of the present invention.
  • a non-coated airbag fabric (hereinafter also simply referred to as fabric) of one embodiment of the present invention is a fabric made of synthetic fibers having a boiling water shrinkage of 5 to 9%.
  • the woven fabric has an air permeability (test differential pressure of 20.0 kPa) immediately after treatment at 200° C. for 1 minute that is 200% or less of the initial air permeability (test differential pressure of 20.0 kPa).
  • the base portion of the woven fabric of the present embodiment is preferably made of synthetic fiber multifilament (hereinafter also referred to as synthetic fiber yarn).
  • the base portion means the portion of the woven fabric body other than the selvage portion.
  • Materials for the synthetic fibers include, for example, polyamide fibers, polyester fibers, aramid fibers, rayon fibers, polysulfone fibers, and ultra-high molecular weight polyethylene fibers.
  • polyamide-based fibers and polyester-based fibers which are excellent in mass productivity and economic efficiency, are preferable.
  • polyamide fibers examples include nylon 6, nylon 66, nylon 12, nylon 46, copolymer polyamide of nylon 6 and nylon 66, nylon 6 copolymerized with polyalkylene glycol, dicarboxylic acid, amine, etc. It is a fiber made of copolyamide or the like.
  • polyamide-based fibers are preferably nylon 6 fibers and nylon 66 fibers because they are particularly excellent in strength.
  • Polyester fibers are, for example, fibers made of polyethylene terephthalate, polybutylene terephthalate, and the like.
  • the polyester fiber may be a fiber made of a copolymer polyester obtained by copolymerizing polyethylene terephthalate or polybutylene terephthalate with isophthalic acid, 5-sodium sulfoisophthalic acid, or an aliphatic dicarboxylic acid such as adipic acid as an acid component. .
  • Synthetic fibers are added with heat stabilizers, antioxidants, light stabilizers, smoothing agents, antistatic agents, plasticizers, thickeners, pigments, etc. , flame retardants, and other additives may be included.
  • the cross-sectional shape of the synthetic fiber monofilament may be a circular cross-section or a flat cross-section.
  • the same synthetic fiber yarn is used as warp and weft.
  • the same synthetic fiber yarn is used for warp and weft means that both warp and weft are made of the same type of polymer, both warp and weft have the same single fiber fineness, and both warp and weft have the same total fineness.
  • Polymers of the same type refer to polymers having a common main repeating unit, such as nylon 66 and polyethylene terephthalate.
  • a combination of a homopolymer and a copolymer is also preferably used as the same kind of polymer as used in the present embodiment.
  • the synthetic fiber thread used as the base thread of the fabric preferably uses a synthetic fiber (filament) with a single fiber fineness of 1 to 10 dtex, more preferably 1 to 7 dtex.
  • a synthetic fiber filament
  • the woven fabric is preferable because it can reduce the air permeability.
  • the single yarn fineness is small, the rigidity of the synthetic fiber is lowered, and the effect of improving the flexibility of the woven fabric is also obtained. Therefore, the obtained airbag has an improved storability, which is preferable.
  • the total fineness of the synthetic fiber threads used as the base threads of the fabric is preferably 150 dtex or more, more preferably 200 dtex or more, and even more preferably 235 dtex or more. Further, the total fineness of the synthetic fiber yarns used as the base yarns of the woven fabric is preferably 600 dtex or less, more preferably 550 dtex or less, and even more preferably 500 dtex or less.
  • the woven fabric tends to maintain excellent strength.
  • the total fineness to 600 dtex or less the resulting woven fabric tends to maintain excellent compactness when stored and low air permeability.
  • the total fineness is within the above range, the woven fabric can be improved in strength, slip resistance, low air permeability, flexibility, and compact storability in a well-balanced manner.
  • the tensile strength of the synthetic fibers (especially the synthetic fiber yarns used as base yarns) constituting the woven fabric of the present embodiment is preferably 8.0 cN/dtex or more, and is preferably 8.3 cN/dtex or more. more preferred.
  • the tensile strength of the synthetic fibers constituting the woven fabric (especially the synthetic fiber yarn used as the base yarn) is preferably 9.0 cN/dtex or less, more preferably 8.7 cN/dtex or less. .
  • the boiling water shrinkage of the synthetic fiber of the present embodiment may be 5% or more. Further, the boiling water shrinkage of the synthetic fiber should be 9% or less, preferably 8% or less. Since the synthetic fiber has a boiling water shrinkage of 5% or more, the woven fabric can be stretched during the heat treatment process to increase the mutual adhesion of the weaving yarns, thereby improving the low air permeability. On the other hand, if the boiling water shrinkage is less than 5%, the synthetic fibers do not shrink sufficiently during the heat treatment process to fabric. As a result, the obtained woven fabric does not have a sufficient effect of cohesion between weaving yarns, and it is difficult to obtain low air permeability.
  • the boiling water shrinkage ratio exceeds 9%, the thickness of the woven fabric after shrinkage is increased, and compactness is impaired.
  • the woven fabric tends to undergo structural changes due to the high temperature during deployment of the inflator, and a base fabric with a small amount of change in air permeability cannot be obtained.
  • the woven fabric produced in this embodiment preferably consists of warp and weft yarns made of the same synthetic fiber yarn as described above, and the texture of the woven fabric is not particularly limited.
  • the woven fabric include plain weave, twill weave, satin weave, variations of these weaves, multiaxial weave, and the like.
  • the woven fabric is preferably plain weave because it has excellent mechanical properties, which are particularly necessary for airbag applications, and is thin.
  • the fabric of the present embodiment has an air permeability (test differential pressure of 20.0 kPa) immediately after being treated at 200 ° C. for 1 minute, and is 200% or less of the initial air permeability (test differential pressure of 20.0 kPa). .
  • the air permeability (test differential pressure 20.0 kPa) immediately after treating the fabric at 200 ° C. for 1 minute is preferably 190% or less with respect to the initial air permeability (test differential pressure 20.0 kPa), preferably 180% The following are more preferable.
  • test differential pressure 20.0 kPa the initial air permeability
  • the fabric is The high-temperature gas emitted from the inflator can be effectively utilized without leakage, and the deployment performance of the airbag can be improved, making it possible to catch the occupant more reliably.
  • the air permeability (test differential pressure 20.0 kPa) immediately after treating the fabric at 200 ° C. for 1 minute exceeds 200% of the initial air permeability (test differential pressure 20.0 kPa), the fabric leaks gas. increases, making it difficult for the airbag to fully deploy.
  • the fabric of this embodiment has an air permeability (test differential pressure of 50.0 kPa) immediately after being treated at 200 ° C. for 1 minute, and is 200% or less of the initial air permeability (test differential pressure of 50.0 kPa). It is preferably 190% or less, more preferably 180% or less.
  • the air permeability (test differential pressure 50.0 kPa) immediately after treating the fabric at 200 ° C. for 1 minute is 200% or less of the initial air permeability (test differential pressure 50.0 kPa), so that the fabric is The high-temperature gas emitted from the inflator can be effectively used without leaking, and the deployment performance of the airbag is improved, making it possible to catch the occupant more reliably.
  • the woven fabric can reduce tearing of the airbag cushion from the sewn portion, and can be easily applied to areas where the airbag cushion is used where high internal pressure is applied.
  • the air permeability test differential pressure 20.0 kPa
  • the fabric leaks gas. becomes large, making it difficult for the airbag to deploy sufficiently.
  • the woven fabric is likely to be limited in areas where the airbag cushion can be applied.
  • a cover factor of 2300 to 2500 is preferable for achieving both low air permeability and high slip resistance.
  • the cover factor is within the above range, the mechanical properties (tensile strength, tear strength, etc.) required for the airbag are properly maintained, and the basis weight is likely to be appropriate, and it is difficult to become rough and hard.
  • the cover factor is less than 2300, the woven fabric tends to undergo changes in the woven structure and breathability due to inflator heat (approximately 200° C.).
  • the cover factor exceeds 2500, the fabric tends to have a large basis weight and tends to be rough and stiff.
  • the cover factor is a value calculated from the total fineness and weaving density of warp or weft yarns, and is defined by the following formula (1).
  • Dw is the warp total fineness (dtex)
  • Nw is the warp density (thread/2.54 cm)
  • Df is the weft total fineness (dtex)
  • Nf is the weft density (thread /2.54 cm).
  • entwining yarns and additional yarns are used for the selvage ends.
  • ear tightening threads are used between the additional threads and the warp threads in order to reduce the ear lobes.
  • the "entanglement thread” is also called a leno, and in order to prevent the selvage from fraying, multiple threads are intertwined on the outermost side of the selvage of the fabric and tighten the weft threads to form selvages.
  • a planetary gear mechanism more preferably a planetary gear twist system.
  • Other methods of forming the ears may be used.
  • the material, type, and fineness of the entwining thread are appropriately selected according to the type of ground thread and weaving density. It is preferable that the number of wires to be used is two or more, more preferably two, at each end. Monofilament is generally used as the entwining thread because it has excellent selvage binding performance.
  • a multifilament may be used as the leno yarn.
  • the material of the entanglement thread is preferably the same as that of the ground thread.
  • the fineness of the entwining yarn is preferably 33 dtex or less. If the fineness exceeds 33 dtex, the woven fabric may fray at the selvage.
  • the fineness of the leno yarn is preferably 5 to 22 dtex.
  • Additional threads are used for the purpose of preventing fraying of the selvage of the fabric, similar to the entwining threads, and are placed between the entwining threads and the warp in the selvage of the fabric to assist the entwining threads.
  • the planetary system is not used for additional yarns.
  • the additional yarn is preferably used in a plain weave that is excellent in selvage tightening properties. Further, the material, type, and fineness of the additional yarn are appropriately selected according to the type of base yarn and the weaving density. As with the entwining yarn described above, the additional yarn is preferably a monofilament that has excellent selvage tightening performance.
  • the number of additional yarns, if used, is, for example, 2 to 12 on each end.
  • the fineness of the additional yarn is preferably 33 dtex or less. If the fineness exceeds 33 dtex, the woven fabric may fray at the selvage.
  • the fineness of the leno yarn is preferably 5 to 22 dtex.
  • Ear tightening thread is sometimes used for the purpose of preventing the selvedge of the fabric, apart from the entanglement thread and the additional thread, and is placed between the additional thread and the warp in the selvage of the fabric. As with the increase yarn, no planetary system is used.
  • the selvage tightening thread is preferably used in a plain weave that is excellent in selvage tightening properties.
  • the material, type, and fineness of the ear tightening thread are appropriately selected according to the type of ground thread and weaving density. Multifilament having a total fineness of 80% or more with respect to the total fineness of the base threads is preferably used as the selvage thread for weaving under high tension.
  • the number of ear tightening threads is for example 4 to 8 on each end.
  • the woven fabric of the present embodiment has weaving yarns YA and YB arranged in the warp direction with different crimp ratios in at least one selvage of the woven fabric, and YA and YB are repeatedly arranged, and the crimp of YA is It is preferable that the ratio CA and the crimp ratio CB of YB satisfy the relationship CA ⁇ CB ⁇ 1.2.
  • the weaving yarns YA and YB having different crimp ratios and arranged in the warp direction are not limited to warp yarns (base yarns), entwining yarns, additional yarns, and ear tightening yarns. .
  • the weaving yarns YA and YB are preferably warp yarns, additional yarns, or selvage yarns.
  • the yarns YA and YB preferably have the same type of polymer or the same total fineness, but may have different polymers or total fineness.
  • the boiling water shrinkage of the weaving yarns YA and YB is preferably 5-9%, more preferably 5-8%. If the boiling shrinkage rate is less than 5%, the weaving yarns YA and YB are difficult to shrink sufficiently during the heat treatment process to the fabric, and it is difficult to achieve the desired crimp rates CA and CB. On the other hand, if the boiling water shrinkage ratio exceeds 9%, the thickness of the woven fabric after shrinkage increases, and the compactness tends to decrease. In addition, the woven fabric tends to deteriorate ear lobes.
  • the weaving yarns YA and YB arranged in the warp direction and having different crimp ratios are preferably arranged repeatedly in at least one selvage of the fabric.
  • the "selves" of a fabric refer to portions within 100 mm from the ends of the fabric.
  • the portion where the weaving yarns YA and YB are repeatedly arranged is preferably arranged within 25 mm from the selvage of the fabric. If the length exceeds 25 mm from the edge of the selvage, the selvage where the weaving yarns YA and YB are repeatedly arranged has different characteristics as a fabric from the base portion of the fabric, so that the portion that can be used for cutting as an airbag becomes smaller. loss may increase.
  • the positions and widths of the weaving yarns YA and YB within 25 mm from the selvage are not particularly limited.
  • the weaving yarns YA and YB are repeatedly arranged at a width of 5 mm or more at a site of 1 to 15 mm from the selvage. preferably.
  • the crimp ratios CA and CB of the weaving yarns YA and YB preferably satisfy the relationship CA ⁇ CB ⁇ 1.2.
  • the crimp ratios CA and CB of the weaving yarns YA and YB more preferably satisfy the relationship CA ⁇ CB ⁇ 2.0, and more preferably satisfy the relationship CA ⁇ CB ⁇ 3.0.
  • the base portion of the woven fabric in this embodiment includes weaving yarns YC arranged in the warp direction intersecting the weft yarns 10 and adjacent weaving yarns YC, as in a general plain weave fabric. , with the same crimp rate. If the weaving density can be increased at this time, the weft yarn driving limit will occur, and the receding of the weave will increase during weaving.
  • the selvedge portion of the fabric in this embodiment is provided with a difference in the crimp rate of each of YA and YB, the crimp structure is changed, and a general plain weave fabric is used. It is possible to make it easier to drive the weft yarn. As a result, the fabric can be densified in weave density. By creating such a crimp structure in the selvage, it becomes easier for the weft to be driven into the selvage than in the base. As a result, it is possible to effectively suppress the receding of the weave before weaving and the occurrence of lobed ears during weaving. In addition, if the woven fabric satisfies the relationship CA ⁇ CB ⁇ 1.2, a sufficient suppression effect due to the crimp structure change can be obtained.
  • YA and YB are preferably arranged adjacently to form a flat weave.
  • the method of arranging YA and YB is preferably, for example, a method of alternately arranging YA and YB (1:1).
  • the method of arranging YA and YB is such that the ratio is changed such that the arrangement is 2:1 or 10:1, or the arrangement is appropriately selected such as 2:2 or 8:8. In this way, it is possible to obtain the effect of suppressing the receding of the weave and the generation of ear lobes.
  • the method of arranging YA and YB it is particularly preferable to arrange YA and YB adjacent to each other at a ratio of 1:1 so that the arrangement is repeated, and a sufficient inhibitory effect can be easily obtained.
  • the woven structure composed of YA and YB can obtain the effect of the present embodiment even when ridged structure is formed by aligning YA and YB, for example. It is particularly preferable that the weave structure composed of YA and YB is a plain weave that is excellent in selvage tightening properties.
  • At least one of YA and YB is preferably made of the same synthetic fiber as the weaving yarn YC arranged in the warp direction constituting the base portion of the fabric.
  • YA and YB are made of yarns having characteristics such as total fineness or shrinkage that are significantly different from those of YC, differences in the thickness and shrinkage characteristics of the woven fabric between the base portion and the selvage portion are likely to appear. Therefore, the woven fabric tends to wrinkle at the selvage when it is wound into a roll and in the subsequent scouring, setting and coating processes.
  • the woven fabric is preferable because the selvage is less likely to wrinkle.
  • YA, YB, and YC are all made of the same synthetic fiber.
  • the YC crimp rate CC preferably satisfies the relationship CA>CC>CB.
  • CA>CC>CB it is easy to obtain a base portion having a woven structure as shown in FIG. 1 and a selvage portion having a woven structure as shown in FIG.
  • the weft yarns in the selvage portion of the woven fabric are denser than in the base portion, and the generation of lobed selvage can be effectively suppressed.
  • CA and CB are smaller than CC (CC>CA>CB)
  • the crimp of the weaving yarn in the selvage portion is smaller than that in the base portion.
  • the woven fabric tends to have coarse and hard selvages, which may cause wrinkles. Also, when CA and CB are larger than CC (CA>CB>CC), the woven fabric cannot obtain sufficient selvage tightening properties, and it is difficult to obtain the effect of suppressing the receding of the texture and the occurrence of lobed selvage.
  • a method for manufacturing a non-coated airbag fabric (hereinafter also simply referred to as a fabric manufacturing method) according to one embodiment of the present invention is the above-described method for manufacturing an uncoated airbag fabric (airbag fabric) according to the present embodiment.
  • the fabric manufacturing method comprises weaving yarns YA and YB arranged in the warp direction with different crimp ratios in at least one selvage of the fabric with different tensions, and tensions TA and TB applied to YA and YB, respectively. is characterized by satisfying the relationship TB ⁇ TA ⁇ 1.2. Therefore, other steps shown below are all examples, and may be replaced with other known steps.
  • the warp yarns having the total fineness described above in relation to the woven fabric are warped and installed on the loom.
  • the weft threads are placed on the loom.
  • a loom is not particularly limited. It is preferable to use a loom equipped with a full-width temple device when weaving high-density fabrics. Examples of looms include water jet looms, air jet looms, rapier looms, and the like. Among these, a water jet loom is preferable as the loom because high-speed weaving is relatively easy and productivity can be easily improved.
  • the tension applied to each warp constituting the base portion of the fabric is adjusted in the range of 0.2 to 0.5 cN/dtex.
  • the warp tension is within the above range, the dimensional stability of the resulting woven fabric can be improved by reducing the inter-filament voids in the bundle of multifilament yarns constituting the woven fabric. If the warp tension is less than 0.2 cN/dtex, the binding force of the weft yarn during weaving is low, and it is difficult to obtain a fabric having the same density between the warp yarn and the weft yarn.
  • a method for adjusting the warp tension is not particularly limited.
  • the warp tension can be adjusted by adjusting the warp let-off speed of the loom, adjusting the weft driving density, or the like. Whether or not the warp tension is within the above range can be confirmed, for example, by measuring the tension applied to each warp between the warp beam and the central portion of the back roller during operation of the loom with a tension measuring instrument.
  • weaving yarns YA and YB arranged in the warp direction with different crimp ratios are woven with different tensions in at least one selvage of a fabric woven by a loom.
  • Each tension TA, TB applied to YB is characterized by satisfying the relationship TB ⁇ TA ⁇ 1.2.
  • the weaving yarns YA and YB arranged in the warp direction and having different crimp ratios are not limited to warp yarns, entanglement yarns, additional yarns, and selvage tightening yarns.
  • the weaving yarns YA and YB are preferably warp yarns, additional yarns, or selvage yarns.
  • the yarns YA and YB are preferably of the same kind of polymer or have the same total fineness. Yarns YA, YB may be of different polymers or total fineness.
  • the weaving yarns YA and YB arranged in the warp direction and having different crimp ratios are preferably arranged repeatedly in at least one selvage of the fabric.
  • the portion where the weaving yarns YA and YB are repeatedly arranged is preferably arranged within 25 mm from the selvage of the fabric. If the length exceeds 25 mm from the edge of the selvage, the number of weaving yarns YA and YB in the woven fabric increases, making it difficult to thread the yarn and manage the tension.
  • the position and width of the weaving yarns YA and YB within 25 mm from the edge of the selvage are not particularly limited. It is preferable that the weaving yarns YA and YB are repeatedly arranged with a width of 5 mm or more at a portion 1 to 15 mm from the selvage.
  • the respective tensions TA and TB applied to the weaving yarns YA and YB satisfy the relationship TB ⁇ TA ⁇ 1.2.
  • the tensions TA and TB preferably satisfy the relationship TB ⁇ TA ⁇ 1.5, and more preferably satisfy the relationship TB ⁇ TA ⁇ 2.0.
  • the tension applied to the weaving yarn is increased during weaving, the crimp rate of the weaving yarn decreases.
  • the tension applied to the yarn during weaving is reduced, the crimp rate of the yarn increases.
  • a method for adjusting the respective tensions TA and TB applied to the weaving yarns YA and YB is not particularly limited.
  • the tensions TA and TB can be adjusted by supplying weaving yarns one by one from a paper tube or bobbin and managing the tension with a tensor such as a spring washer. It can be adjusted by a method of preparing a beam for the warp yarn, a method of changing the tension for winding only the selvage yarn when the warp beam is warped, and the like.
  • the ranges of the respective tensions TA and TB applied to the weaving yarns YA and YB are not particularly limited.
  • the tensions TA and TB are preferably adjusted in the range of 0.1 to 0.6 cN/dtex.
  • the fabric manufacturing method of the present embodiment it is preferable to form a plain weave by arranging YA and YB adjacent to each other.
  • the method of arranging YA and YB is preferably, for example, a method of alternately arranging YA and YB (1:1).
  • the method of arranging YA and YB is such that the ratio is changed such that the arrangement is 2:1 or 10:1, or the arrangement is appropriately selected such as 2:2 or 8:8. In this way, it is possible to obtain the effect of suppressing the receding of the weave and the generation of ear lobes.
  • the method of arranging YA and YB it is particularly preferable to arrange YA and YB adjacent to each other at a ratio of 1:1 so that the arrangement is repeated, and a sufficient inhibitory effect can be easily obtained.
  • the woven structure composed of YA and YB can obtain the effects of the present embodiment even when the ridge structure is formed by aligning YA and YB, for example. It is particularly preferable that the woven weave is a flat weave that is excellent in selvage tightening properties.
  • At least one of YA and YB is preferably made of the same synthetic fiber as the weaving yarn YC arranged in the warp direction constituting the base of the fabric.
  • the obtained fabric tends to show differences in thickness and shrinkage characteristics as a fabric between the base portion and the selvage portion. Therefore, the obtained fabric tends to have wrinkles in the selvage when the woven fabric is wound into a roll and in the subsequent scouring and setting processes.
  • the woven fabric is preferable because the selvage is less likely to wrinkle.
  • YA, YB, and YC are all made of the same synthetic fiber.
  • the tension TC applied to YC preferably satisfies the relationship TB>TC>TA.
  • the relationship TB>TC>TA it is easy to obtain the base portion having the woven structure as shown in FIG. 1 and the selvage portion having the woven structure as shown in FIG.
  • the resulting woven fabric is more likely to be driven by the weft in the selvage than in the base.
  • the woven fabric can effectively suppress the receding of the weave before weaving and the generation of ear lobes that occur during weaving.
  • TA and TB are larger than TC (TB>TA>TC)
  • the crimp of the weaving yarn in the selvage portion is smaller than that in the base portion.
  • the woven fabric tends to have coarse and hard selvages, which may cause wrinkles.
  • the selvage of the woven fabric may collapse. If TA and TB are larger than TC (TA > TB > TC), the woven fabric cannot obtain sufficient selvage tightening properties, and it is difficult to obtain the effect of suppressing the receding of the weave and the occurrence of lobed selvage. Become.
  • the resulting fabric is dried if necessary.
  • the drying temperature is usually 80° C. or higher.
  • the drying temperature is 80° C. or higher, the woven fabric has a small dry heat shrinkage and improved dimensional stability. As a result, the woven fabric can be suitably used as an airbag.
  • the scouring temperature in the scouring process is preferably 20° C. or higher, more preferably 25° C. or higher. Also, the scouring temperature is preferably 90° C. or lower, more preferably 85° C. or lower.
  • the scouring temperature is 20° C. or higher, the woven fabric is freed of residual strain, the single filaments in the multifilament yarn are more likely to move, and the multifilament yarn can spread flatly with respect to the woven fabric. As such, the fabric may have improved dimensional stability. Further, when the scouring temperature is 90° C. or lower, large shrinkage of the multifilament is suppressed. As a result, the fabric may have improved dimensional stability.
  • the heat setting temperature in heat setting is preferably a temperature that can remove residual strain in the woven fabric after weaving and can suppress large shrinkage of the multifilament yarn.
  • the heat setting temperature is preferably 110° C. or higher, more preferably 120° C. or higher.
  • the heat setting temperature is preferably 190° C. or lower. When the heat setting temperature is within the above range, the resulting fabric may have improved dimensional stability.
  • the fabric manufacturing method of the present embodiment it is possible to suppress the receding of the edge of the selvage during weaving of the non-coated airbag fabric, and to reduce the selvage.
  • the scouring performed after weaving, the processing passability in the setting process, and the cutting and sewing properties are excellent.
  • An airbag fabric can be provided.
  • a woven fabric made of synthetic fibers having a boiling water shrinkage of 5 to 9%, and the air permeability immediately after treatment at 200 ° C. for 1 minute (test differential pressure 20.0 kPa) is the initial air permeability (test differential pressure 20.0 kPa ), which is 200% or less for non-coated airbags.
  • At least one selvage has weaving yarns YA and YB arranged in the warp direction with different crimp ratios, and YA and YB are arranged repeatedly, and the crimp ratios CA and YB of YA are arranged repeatedly.
  • the synthetic fibers are polyamide fibers, and the warp and weft constituting the fabric are multifilaments having a total fineness of 150 to 600 dtex and a single fiber fineness of 1 to 10 dtex, (1) to ( 4)
  • the fabric for non-coated airbags according to any one of items 4).
  • total fineness The total fineness was calculated by measuring the regular fineness with a predetermined load of 0.045 cN/dtex according to JIS L 1013:2010 8.3.1 A method.
  • the number of filaments was calculated based on the method of JIS L 1013:2010 8.4.
  • the single fiber fineness was calculated by dividing the total fineness by the number of filaments.
  • boiling water shrinkage The boiling water shrinkage rate was calculated based on JIS L 1013:2010 8.18.1 Hot water shrinkage rate B method 100°C.
  • weave density The weave density of each warp and weft was calculated based on JIS L 1096:2010 8.6.1. Specifically, the sample was placed on a flat table, unnatural wrinkles and tension were removed, and the number of warp and weft yarns in a 2.54 cm section was counted at five different locations, and the average value of each was calculated.
  • the thickness of the base fabric was calculated based on JIS L 1096:2010 8.4. Specifically, five different points on the sample were measured using a thickness gauge under a pressure of 23.5 kPa, after waiting for 10 seconds for the thickness to settle down, and the average value was calculated.
  • Tensile strength is JIS K 6404-3:19996. Based on test method B (strip method), 5 test pieces were taken in each of the warp and weft directions, and the yarn was removed from both sides to make the width 30 mm. The specimen was pulled at a gripping distance of 150 mm and a tensile speed of 200 mm/min until the specimen was cut, and the maximum load until cutting was measured, and the average value was calculated for each of the warp and weft directions.
  • test method B strip method
  • 5 test pieces are taken in each of the warp and weft directions, and the thread is removed from both sides of the width to make a width of 30 mm, and 100 mm in the center of these test pieces.
  • Marked lines are attached to the intervals, and the test piece is pulled with a constant-speed tension type tester at a gripping interval of 150 mm and a tensile speed of 200 mm / min until it breaks, and the distance between the marked lines when cutting is read. It was calculated based on the formula (2) of.
  • E [(L ⁇ 100)/100] ⁇ 100 (2)
  • E indicates elongation at break (%)
  • L indicates the distance (mm) between marked lines at the time of cutting.
  • the breaking elongation was calculated as an average value in each of the warp and weft directions.
  • test method B single tongue method
  • five test pieces each having a long side of 200 mm and a short side of 75 mm were taken in both the warp and weft directions, and a short length was placed in the center of the short side of the test piece.
  • a notch of 75 mm was made perpendicular to the side direction, and the test piece was torn at a gripping interval of 75 mm and a tensile speed of 200 mm/min with a constant-speed tension type tester until the test piece broke, and the tearing load at that time was measured.
  • Three points were selected in descending order from the maximum points excluding the first peak from the chart recording line of the obtained tear load, and the average value thereof was calculated. After that, average values were calculated for each of the longitudinal and weft directions.
  • the initial air permeability was determined by measuring the air permeability when tested at a test differential pressure of 20.0 kPa or 50.0 kPa based on JIS L 1096:1999 8.27.1 A method (Fragile method). Take a test piece of about 20 cm x 20 cm from five different places on the sample, attach the test piece to one end of a cylinder with a diameter of 100 mm, fix it so that there is no air leakage from the attachment point, and use a regulator to test the differential pressure. The pressure was adjusted to 20.0 kPa, the amount of air passing through the test piece at that time was measured with a flow meter, and the average value for the five test pieces was calculated.
  • Air permeability immediately after treatment at 200°C for 1 minute air permeability after high temperature treatment
  • the air permeability after high temperature treatment was determined by measuring the air permeability when tested at a test differential pressure of 20.0 kPa or 50.0 kPa based on JIS L 1096:1999 8.27.1 A method (Frazier type method).
  • a test piece of about 20 cm x 20 cm was collected from five different locations on the sample, placed in a dryer controlled at 200 ° C ⁇ 2 ° C so that no tension was applied to the test piece, and heat-treated for 1 minute. provided.
  • test piece After that, remove the test piece from the dryer, attach the test piece to one end of a cylinder with a diameter of 100 mm within 10 seconds in an atmosphere of 20 ⁇ 2 ° C., 65 ⁇ 5% RH, and measure the air permeability in the same manner as the initial air permeability. was measured, and the average value for 5 test pieces was calculated.
  • crimp rate The crimp rate was measured based on JIS L 1096:2010 8.7 (B method).
  • the weave contact timing is measured by applying a timing light for the loom while the loom is operating and weaving the fabric, and the ground part in the center of the fabric and the weft supply side / anti-yarn supply side are measured. Each selvage was measured, and the selvage was calculated as the average value of the yarn feeding side and the non-yarn feeding side. For the evaluation of weave receding, the difference between the ground part and the selvage is judged as the size of the weave receding. was "B", and 8° or more was "C”.
  • warp, weft The warp and weft are made of nylon 66, have a circular cross-sectional shape, are composed of 136 single filaments with a single fiber fineness of 3.5 dtex, a total fineness of 470 dtex, and a tensile strength of 8.5 cN/dtex.
  • the leno yarn used was a 22 detex nylon 66 monofilament, two on each ear, fed from a planetary system.
  • the additional yarn a 22 dtex nylon 66 monofilament similar to the leno yarn was used, and 8 yarns were supplied to each selvage from a bobbin.
  • the selvage tightening threads the same 470 dtex untwisted synthetic fiber filaments as the warp constituting the base were used, and 24 filaments were used for each of the selvages.
  • the beam for supplying the selvage tightening thread is prepared with a low tension beam with a supply tension of 0.20 cN/dtex and a high tension beam with a supply tension of 0.50 cN/dtex.
  • Low tension (YA) and high tension (YB) yarns were alternately arranged in a 1:1 ratio for weaving.
  • the tension of the warp yarns (YC) forming the base portion was 0.40 cN/dtex.
  • the resulting fabric was scoured at 65°C with an open soap scouring machine, washed with hot water at 40°C, and dried at 120°C. Furthermore, using a pin tenter dryer, the width ratio is set to be the same as the width of the fabric after drying, and the fabric is heat set at 180 ° C. for 60 seconds under a dimensional regulation with an overfeed rate of 2%. did. Table 1 shows the properties of the resulting fabric. The resulting woven fabric showed little change from the initial air permeability at both test differential pressures of 20.0 kPa and 50.0 kPa.
  • Example 2 An airbag fabric was produced in the same manner as in Example 1, except that the weave density of both warp and weft was changed to 55 threads/2.54 cm.
  • Example 3 The warp and weft are made of nylon 66, have a circular cross-sectional shape, are composed of 72 single filaments with a single fiber fineness of 6.5 dtex, a total fineness of 470 dtex, and a tensile strength of 8.5 cN/dtex.
  • An airbag fabric was produced in the same manner as in Example 2, except that the filaments had an elongation of 23.5% and a boiling water shrinkage of 6.2%, and were changed to non-twisted synthetic filaments.
  • the warp, weft, and selvage threads are made of nylon 66, have a circular cross-sectional shape, are composed of 136 single fibers with a single fiber fineness of 2.6 dtex, a total fineness of 350 dtex, and a tensile strength of 8.0. 5 cN / dtex, elongation is 24.5%, boiling water shrinkage is 6.2%, untwisted synthetic fiber filament is used, warp weave density is 62 / 2.54 cm, weft weave density is An airbag fabric was produced in the same manner as in Example 1, except that the number of threads was 62/2.54 cm.
  • Example 5 The warp and weft are made of nylon 66, have a circular cross-sectional shape, are composed of 136 single filaments with a single fiber fineness of 3.5 dtex, a total fineness of 470 dtex, and a tensile strength of 8.5 cN/dtex.
  • An airbag fabric was produced in the same manner as in Example 1, except that untwisted synthetic fiber filaments having an elongation of 23.5% and a boiling water shrinkage of 8.4% were prepared. In weaving, we were able to suppress the receding of the weave opening of the selvage.
  • Example 6 An airbag fabric was woven in the same manner as in Example 1, except that the ear tightening thread was not used.
  • the crimp rate of YC forming the ground portion was 10%.
  • the obtained fabric had a large selvage, and during weaving, the selvage of the weave was largely set back, and the selvage was fuzzy, so that it could not be used as a fabric for airbags.
  • Table 1 shows the properties of the resulting fabric.
  • the obtained fabric was a base fabric with a large amount of change from the initial air permeability at a test differential pressure of 50.0 kPa.
  • the warp and weft are made of nylon 66, have a circular cross-sectional shape, are composed of 136 single filaments with a single fiber fineness of 3.5 dtex, a total fineness of 470 dtex, and a tensile strength of 8.5 cN/dtex.
  • An airbag fabric was woven in the same manner as in Example 1, except that synthetic fiber filaments having an elongation of 23.5%, a boiling water shrinkage of 9.3%, and no twist were used.
  • YA with a crimp rate CA of 14% and YB with a crimp rate CB of 5% were repeatedly arranged at a ratio of 1:1.
  • the crimp rate of the fabric was 11%, and the resulting woven fabric had small selvages and uniform and good selvage tightness.
  • Table 1 shows the properties of the resulting fabric.
  • the obtained woven fabric showed a large amount of change from the initial air permeability at both test differential pressures of 20.0 kPa and 50.0 kPa.
  • Example 2 An airbag fabric was produced in the same manner as in Example 1, except that the weaving density of both warp and weft was changed to 53 threads/2.54 cm. In the selvage portion of the obtained fabric, YA with a crimp rate CA of 11% and YB with a crimp rate CB of 5% were repeatedly arranged at a ratio of 1:1. The crimp rate of the fabric was 8%, and the resulting woven fabric had small selvages and uniform and good selvage tightness. Table 1 shows the properties of the resulting fabric. The resulting woven fabric showed a large amount of change from the initial air permeability at both test differential pressures of 20.0 kPa and 50.0 kPa.
  • Example 3 An airbag fabric was produced in the same manner as in Example 1, except that the weaving density of both warp and weft was changed to 46 threads/2.54 cm. YA with a crimp rate CA of 8% and YB with a crimp rate CB of 5% were repeatedly arranged at a ratio of 1:1 in the selvage portion of the obtained fabric. The crimp rate of the fabric was 6%, and the resulting woven fabric had a small selvage and a uniform and good selvage tightness. Table 1 shows the properties of the resulting fabric. The obtained woven fabric showed a large amount of change from the initial air permeability at both test differential pressures of 20.0 kPa and 50.0 kPa.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Woven Fabrics (AREA)

Abstract

L'invention concerne un tissu tissé destiné à un coussin de sécurité gonflable non revêtu présentant une légère différence entre la perméabilité à l'air initiale et la perméabilité à l'air immédiatement après un traitement à une température élevée (200 °C pendant une minute). Le tissu tissé destiné à un coussin de sécurité gonflable non revêtu comprend des fibres synthétiques présentant un taux de retrait dans l'eau bouillante de 5 à 9 %, et la perméabilité à l'air (pression différentielle d'essai de 20,0 kPa) immédiatement après le traitement à 200 °C pendant une minute est inférieure ou égale à 200 % par rapport à la perméabilité à l'air initiale (pression différentielle d'essai de 20,0 kPa).
PCT/JP2022/002124 2021-02-26 2022-01-21 Tissu tissé pour coussin de sécurité gonflable non revêtu WO2022181136A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002220760A (ja) * 2001-01-17 2002-08-09 Toyobo Co Ltd 高密度織物の製織法
WO2011055562A1 (fr) * 2009-11-09 2011-05-12 旭化成せんい株式会社 Coussin gonflable de sécurité et matériau textile destiné à celui-ci
WO2020121670A1 (fr) * 2018-12-14 2020-06-18 東レ株式会社 Tissu de coussin de sécurité gonflable et procédé de fabrication de tissu de coussin de sécurité gonflable

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002220760A (ja) * 2001-01-17 2002-08-09 Toyobo Co Ltd 高密度織物の製織法
WO2011055562A1 (fr) * 2009-11-09 2011-05-12 旭化成せんい株式会社 Coussin gonflable de sécurité et matériau textile destiné à celui-ci
WO2020121670A1 (fr) * 2018-12-14 2020-06-18 東レ株式会社 Tissu de coussin de sécurité gonflable et procédé de fabrication de tissu de coussin de sécurité gonflable

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